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        var d = new Date().getDay();
        switch (d) {
            case 0:
                x = "今天是星期日";
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            case 1:
                x = "今天是星期一";
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            case 2:
                x = "今天是星期二";
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            case 3:
                x = "今天是星期三";
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            case 4:
                x = "今天是星期四";
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            case 5:
                x = "今天是星期五";
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            case 6:
                x = "今天是星期六";
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